- βMost CGMs are water-resistant but benefit from extra waterproofing measures like overpatches for swim safety
- βProper skin preparation and sensor placement dramatically reduce the risk of adhesive failure in water
- βAlways confirm glucose readings with a fingerstick if your sensor is unexpectedly submerged beyond its rating
Can You Swim with a CGM?
For many people living with diabetes, continuous glucose monitors (CGMs) have become indispensable tools for staying safe and informed around the clock. But when swim season arrives β or your workout routine includes the pool β a common question surfaces: can I actually swim with my CGM?
The short answer is yes, most modern CGMs are water-resistant. However, water-resistant is not the same as waterproof, and understanding that difference could save your sensor from an expensive, premature failure.
Understanding Water Resistance Ratings
Most popular CGMs β including the Dexcom G6, G7, Libre 2, and Libre 3 β carry an IP28 or similar water-resistance rating. This typically means the device can withstand immersion in up to one meter of water for 30 minutes under controlled conditions. Real-world swimming, however, presents different challenges:
- Repeated pressure changes from diving or flip turns
- Chlorine and saltwater can degrade adhesive over time
- Extended swim sessions beyond the rated duration
- Water temperature extremes in hot tubs or cold open water
Knowing your specific CGM's rating is the first step. Check the manufacturer's documentation or visit mdsdiabetes.com to find sensor-compatible supplies and accessories for your device.
Waterproofing Your CGM Before You Swim
1. Use Overpatches and Adhesive Covers
One of the most effective ways to protect your sensor from water infiltration is applying a waterproof overpatch. These thin, transparent films sit directly over your sensor, creating an additional seal against moisture. Popular options include Skin Tac, Tegaderm, and Simpatch. Apply the overpatch 24 hours before swimming to allow full adhesion.
2. Prep Your Skin Properly
Clean, dry, and oil-free skin is critical. Shave the application site if needed, and use an alcohol wipe followed by a skin barrier wipe to maximize adhesive grip. Avoid moisturizers or sunscreen near the sensor site on swim days.
3. Choose Your Placement Wisely
Placement matters more than many people realize. The back of the upper arm (common for Libre users) can experience significant friction from swim strokes. Consider the abdomen or lower back for less mechanical stress during freestyle or butterfly strokes.
During and After Your Swim
Even with preparation, a few habits will extend your sensor's lifespan:
- Pat β don't rub β the sensor area dry after swimming
- Avoid peeling up edges to check; this invites water intrusion
- Rinse with fresh water after pool or ocean sessions to remove chlorine and salt
- Allow the sensor to fully dry before applying compression garments
What to Do If Your CGM Gets Wet Unexpectedly
If your sensor is submerged beyond its rating, stay calm. Dry the area thoroughly and monitor for adhesive lifting. Readings may be temporarily inaccurate β always confirm with a fingerstick blood glucose check if you feel symptomatic. Replacement sensors and adhesive accessories are available through mdsdiabetes.com, where you can find supplies tailored to your specific CGM brand.
Special Considerations for Open Water and Hot Tubs
Ocean swimming introduces salt and sand, both of which can compromise adhesive bonds faster than pool water. Hot tubs present elevated temperatures that can affect both adhesive and sensor electronics. Limit hot tub sessions to under 20 minutes and consider removing transmitters (where possible) during extended soaks.
Final Thoughts
Swimming with a CGM is absolutely manageable with the right preparation. Invest in quality overpatches, prep your skin carefully, and understand your device's specific limitations. With these steps in place, you can focus on your swim β not your sensor.